At first glance, this series of images from Francois Brunelle depicts twins - plain and simple. However, the actual truth of the matter is that the collection of images depict doppelgangers - individuals who look a lot like each other but aren't actually related at all. I'm not a look-alike is eerie a times. Granted, dressing two people up almost identically, styling them similarly and capturing all photos in black/white certainly helps to push the similarities but it's a good trick and a strange reminder of the gene pool we're dealing with out there.

More examples here or here.